WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Open the endgate.
Remove the bolts from the endgate handle.
Remove the endgate handle from the endgate handle assembly.
Fig 1: Removing Procedure Of Handle Replacement - End Gate